Finding the Fourth Proportional to 12,868.55, 17,758.83 and 7,279.55

Step by Step Solution

1. Step 1: Write the proportion equation
   12,868.55 : 17,758.83 = 7,279.55 : x
2. Step 2: Convert to fraction form
   12,868.55/17,758.83 = 7,279.55/x
3. Step 3: Cross multiply
   12,868.55x = 17,758.83 × 7,279.55
4. Step 4: Simplify right side
   12,868.55x = 129,276,165.73
5. Step 5: Solve for x
   x = 129,276,165.73/12,868.55
6. Step 6: Final answer
   x = 10,045.90